I purchased a secondhand Bobobie Erin whose resin had yellowed/greened through age. The doll's head/body were otherwise in good condition.
The doll is going to be destroyed and put back together in various ways to see whether there's a good, consistent way to hide bonding material under pastels, acrylic paint, and airbrushing. Most coloring media reacts differently on various bonding and modding materials.
The last time I used an airbrush on a consistent basis was when I was doing SFX makeup for convention cosplay, so this will also be my practice doll to get back into the swing of things.